Stable Cycling of a 4 V Class Lithium Polymer Battery Enabled by In Situ Cross-Linked Ethylene Oxide/Propylene Oxide Copolymer Electrolytes with Controlled Molecular Structures

2021 ◽  
Author(s):  
Woonghee Choi ◽  
Yongku Kang ◽  
In-Jung Kim ◽  
Byeong-Gi Seong ◽  
Woong-Ryeol Yu ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Propylene Oxide ◽  
Molecular Structures ◽  
Lithium Polymer Battery ◽  
Polymer Battery

The poly(propylene oxide-co-ethylene oxide) gradient is controlled by the polymerization method: determination of reactivity ratios by direct comparison of different copolymerization models

2019 ◽  
Vol 10 (22) ◽  
pp. 2863-2871 ◽  
Author(s):  
Jan Blankenburg ◽  
Erik Kersten ◽  
Kamil Maciol ◽  
Manfred Wagner ◽  
Sirus Zarbakhsh ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Ethylene Oxide ◽  
Propylene Oxide ◽  
Reactivity Ratios ◽  
H Nmr ◽  
Poly Propylene ◽  
Polymerization Method

An investigation of the copolymerization of EO and PO by in situ1H NMR spectroscopy reveals striking differences in the monomer gradient, depending on the polymerization method.

Development of a versatile portable MAX-DOAS instrument

2020 ◽  
Author(s):  
Wolfgang Kausch ◽  
Stefan Kimeswenger ◽  
Norbert Przybilla ◽  
Stefan Noll
Keyword(s):  
Trace Gases ◽  
Resolving Power ◽  
Optical Absorption Spectroscopy ◽  
Analysis Software ◽  
Control Software ◽  
Lithium Polymer Battery ◽  
The Earth ◽  
The Status ◽  
Polymer Battery

<p>Multi-AXis Differential Optical Absorption Spectroscopy has become a versatile and mature measurement technique for determining various components of the Earth’s atmosphere, e.g. O<sub>3</sub>, SO<sub>2</sub>, NO<sub>2</sub> properties. Since the concentration of these trace gases might strongly vary locally and in time, easy in-situ measurements with a mobile device are highly desirable.</p><p>We are currently developing a portable MAX-DOAS instrument setup consisting of three small telescopes with a diameter of 50mm. Each of these telescopes is equipped with an individual fiber-fed low-resolution spectrograph (Stellarnet Blue Wave devices, 2048 pixel CCD) to enable simultaneous measurements ranging from 300 to 1000nm in one shot. The entire wavelength range is therefore covered by three spectral arms: (a) The UV arm, equipped with a Stellarnet BLUE-Wave UV2 spectrograph ranging from 300 to 500nm; (b) the VIS arm consisting of a NIR4 device (500…700nm), and (c) The NIR arm, based on a Stellarnet NIR2 ranging from 600 to 1000nm. All spectrographs are fed with wavelength-optimised fibers and equipped with the smallest possible slit (14 µm slit width) to maximise the throughput and the spectral resolving power (λ-dispersion UVB + VIS: 0.2nm; NIR: 0.4nm).</p><p>The three telescopes are aligned in parallel and installed on a small astronomical azimuthal mount (Skywatcher AZ-EQ5, powered by a mobile 12V Lithium-Polymer battery) to enable measurements in all directions. The mount control software will be based either on the ASCOM or the INDILIB platform. For the control of the spectrographs we use the programme SpectraWiz (by Stellarnet). As DOAS analysis software we have chosen QDOAS, provided by the Royal Belgian Institute for Space Aeronomy. All software is freely available and is installed on a Dell Latitude 5450 Rugged laptop, which is optimised for outdoor applications.</p><p>The chosen setup enables a mobile usage easily transportable by a small car. Since the development is currently ongoing, especially with respect to the automation of the measurements and the data processing, we report on the status of the project in this presentation.</p>

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